The red engine management light came on in my 2011 1.5DCi with 93K on the clock. AA man checked and cleared the code - it indicated Ash accumulation in the DPF. After resetting I drove it on the motorway for about half an hour in third gear with high revs (about 3500 rpm) plus I added a dose of DPF cleaner from Halford's to a half tank of fuel. Light has stayed off.

Is that it sorted then? Is there any way of telling whether I managed to clear it?

Car does a 20 mile commute twice a day on motorway, but often stuck in traffic for about half of it before I get any speed up. It does go on long trips occasionally, but hasn't been far for a couple of months.

The soot in the exaust gas of a Diesel engine is accumulated in the DPF. When there's too much soot in th DPF a regeneration run is triggered. While regenerating the soot is burned and leaves ash as residue in the DPF. I don't know whether 93,000 miles leave enough ash in the DPF to render it unusable for the intended purpose.In case of too much ash in the DPF it has to be replaced for a new one or given a proper cleaning by a firm specialised in that kinda work.

The DPF has to be taken off and cleaned by a specialist firm - usually a lot cheaper than buying a new one...

BTW, my 2.0 dCI has some 76,000 miles on the clock and there are no problems with the DPF whatsoever... - I commute about 14 miles twice daily (tripartite in city roads, rural roads, and motorway), however, once in a while I let the Qashqai "fly low" over the German motorway when going on holiday, visiting the family, etc.

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